Outlook 2007 won't update in cached mode

I have a PC running XP with Office 2007 that is having email problems. Earlier this week we had to reboot our email server and after it came back, one of the users was unable to open her Outlook 2007. I have since discovered that if I uncheck cached mode, Outlook opens and I see the emails on the server in her mailbox, but the computer runs VERY slow at this point. Slow to the point where it is unusable. If I change that configuration and set it to use cached mode, all I get is a message saying "Waiting to update folders" or something similar to that. Basically it's the same message you get when first setting up a new account in Outlook and it is updating folders. In this case, it never updates. I have left it over night and still nothing. I am able to configure Outlook on another PC for the previous user's account and it works fine. The affected user is currently using OWA on the problem PC and everything is functioning fine, so it doesn't seem to be malware. Any ideas?

It sounds like a corrupt ost file. You can do a search on the PC for *.ost -> Rename the file to .old and then open outlook again. Outlook will at this point configure a new ost file and all should be well.

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I finally got the problem resolved. It appears that there may have been a problem with one or more of the add-ins in Outlook. I was able to get it resolved without recreating the windows profile. I disabled cached mode on the email account, opened Outlook in Safe mode, removed or disabled all of the add-ins, restarted Outlook in normal mode, stopped outlook and deleted the current OST and then reset the cached mode and opened Outlook normally. It took a bit, but it finally synched all the emails. I have not gone through and reenabled all the add-ins yet to see which one was causing the problem.

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